Shadow Flicker:

Shadow flicker happens when the sun is low in the sky (usually when rising or setting) and shines on a building from behind a turbine. This can cause the shadow of the rotating turbine blades to be cast onto the building and through windows.  Many residents who suffer from this phenomenon describe it as ‘like a light being flicked on and off over and over again’.

Wind farm developers use computer software programs to predict the number of hours, the time of year and number of weeks per year that a property could be affected.  Worst case scenarios are usually prepared, but in reality the actual time someone may be affected depends on several factors including weather conditions i.e. there may be cloud cover so the flicker effect is not noticed.